Electrochemical STM investigation of C70, C60/C70 mixed fullerene and hydrogenated fullerene adlayers on Au(111) prepared using the electrochemical replacement method

Uemura, Shinobu; Taniguchi, Ikuo; Sakata, Masayo; Kunitake, Masashi

doi:10.1016/j.jelechem.2008.01.013

Cited by 10 publications

(4 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The single-crystal beads were mechanically polished to form Au(111) cut samples, and these were used for cyclic voltammetry (CV). Electrode preparation was the same as described earlier. , The Au(111) electrodes were annealed with a hydrogen flame and then immediately cooled by immersion in ultrapure water. Annealed Au(111) was transferred into an electrochemical STM cell filled with a prepared solution.…”

Section: Experimental Methodssupporting

confidence: 93%

Two-Dimensional Self-Assembled Structures of Melamine and Melem at the Aqueous Solution−Au(111) Interface

et al. 2010

Self Cite

View full text Add to dashboard Cite

Self-assembled structures of melamine and the condensed melamine derivative melem were investigated at aqueous solution-Au(111) interfaces by cyclic voltammetry and in situ scanning tunneling microscopy (STM) observation. The adsorption/desorption behaviors of both molecules on Au(111) surfaces could be controlled by varying the electrochemical potential and solution concentration. In the negative potential region, self-assembled structures of melem and melamine were constructed by double hydrogen bonding systems between nitrogen atoms of triazine rings and amine groups. In addition, melem formed a closely packed structure at potentials of between -0.3 and -0.15 V or in solutions at higher concentrations.

show abstract

Section: Experimental Methodssupporting

confidence: 93%

Two-Dimensional Self-Assembled Structures of Melamine and Melem at the Aqueous Solution−Au(111) Interface

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, the restored pentacene adlayer was highly ordered with a single ordered domain spanning 50 nm or more. It appears that pentacene admolecules were not reduced at 0.15 V, so that ordered pentacene structures could be restored by changing potential to E > 0.3 V. These potential changes in electrified interface of Au(111) are mostly consistent with those observed with coronene, fullerene molecules, etc. , In fact, it is shown that one can use a similar method to prepare ordered C 60 and C 70 molecular adlayers …”

Section: Resultssupporting

confidence: 58%

“…By immersing gold sample into a benzene dosing solution, coronene, pentacene, etc. are adsorbed spontaneously onto Au(111) in highly ordered arrays. − …”

Section: Introductionmentioning

confidence: 99%

In Situ STM Imaging of the Structures of Pentacene Molecules Adsorbed on Au(111)

Pong¹,

Yau²,

Huang³

et al. 2009

Langmuir

View full text Add to dashboard Cite

In situ scanning tunneling microscope (STM) was used to examine the spatial structures of pentacene molecules adsorbed onto a Au(111) single-crystal electrode from a benzene dosing solution containing 16-400 microM pentacene. Molecular-resolution STM imaging conducted in 0.1 M HClO(4) revealed highly ordered pentacene structures of ( radical31 x radical31)R8.9 degrees , (3 x 10), ( radical31 x 10), and ( radical7 x 2 radical7)R19.1 degrees adsorbed on the reconstructed Au(111) electrode dosed with different pentacene solutions. These pentacene structures and the reconstructed Au(111) substrate were stable between 0.2 and 0.8 V [vs reversible hydrogen electrode, RHE]. Increasing the potential to E > 0.8 V lifted the reconstructed Au(111) surface and disrupted the ordered pentacene adlattices simultaneously. Ordered pentacene structures could be restored by applying potentials negative enough to reinforce the reconstructed Au(111). At potentials negative of 0.2 V, the adsorption of protons became increasingly important to displace adsorbed pentacene admolecules. Although the reconstructed Au(111) structure was not essential to produce ordered pentacene adlayers, it seemed to help the adsorption of pentacene molecules in a long-range ordered pattern. At room temperature (25 degrees C), approximately 100 pentacene molecules seen in STM images could rotate and align themselves to a neighboring domain in 10 s, suggesting that pentacene admolecules could be mobile on Au(111) under the STM imaging conditions of -150 mV in bias voltage and 1 nA in feedback current.

show abstract

“…Considering that the crystallinity of the C 60 films leads to lower device performance, we added a small amount of C 70 into the C 60 solution to suppress the crystallinity of the spin-coated C 60 film. C 60 - and C 70 -mixed fullerene films (referred to as “mixed fullerene films” hereafter) are reported to possess lower crystallinity than pure C 60 . , Furthermore, the native C 60 and C 70 mixtures obtained during fullerene synthesis are considerably less expensive than the pure compounds . GIXRD spectra in Figure a show that the mixed fullerene film exhibits much weaker (111) and (220) peaks.…”

Section: Resultsmentioning

confidence: 99%

Achieving High Efficiency in Solution-Processed Perovskite Solar Cells Using C₆₀/C₇₀ Mixed Fullerenes

Lin

Jeon

Xiang

et al. 2018

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Fullerenes have attracted considerable interest as an electron-transporting layer in perovskite solar cells. Fullerene-based perovskite solar cells produce no hysteresis and do not require high-temperature annealing. However, high power conversion efficiency has been only achieved when the fullerene layer is thermally evaporated, which is an expensive process. In this work, the limitations of a solution-processed fullerene layer have been identified as high crystallinity and the presence of remnant solvents, in contrast to a thermally deposited C60 film, which has low crystallinity and no remaining solvents. As a solution to these problems, a mixed C60 and C70 solution-processed film, which exhibits low crystallinity, is proposed as an electron-transporting layer. The mixed-fullerene-based devices produce power conversion efficiencies as high as that of the thermally evaporated C60-based device (16.7%) owing to improved fill factor and open-circuit voltage. In addition, by vacuum-drying the mixed fullerene film, the power conversion efficiency of the solution-processed perovskite solar cells is further improved to 18.0%. This improvement originates from the enhanced transmittance and charge transport by removing the solvent effect. This simple and low-cost method can be easily used in any type of solar cells with fullerene as the electron-transporting layer.

show abstract

Electrochemical STM investigation of C70, C60/C70 mixed fullerene and hydrogenated fullerene adlayers on Au(111) prepared using the electrochemical replacement method

Cited by 10 publications

References 48 publications

Two-Dimensional Self-Assembled Structures of Melamine and Melem at the Aqueous Solution−Au(111) Interface

Two-Dimensional Self-Assembled Structures of Melamine and Melem at the Aqueous Solution−Au(111) Interface

In Situ STM Imaging of the Structures of Pentacene Molecules Adsorbed on Au(111)

Achieving High Efficiency in Solution-Processed Perovskite Solar Cells Using C₆₀/C₇₀ Mixed Fullerenes

Contact Info

Product

Resources

About

Electrochemical STM investigation of C70, C60/C70 mixed fullerene and hydrogenated fullerene adlayers on Au(111) prepared using the electrochemical replacement method

Cited by 10 publications

References 48 publications

Two-Dimensional Self-Assembled Structures of Melamine and Melem at the Aqueous Solution−Au(111) Interface

Two-Dimensional Self-Assembled Structures of Melamine and Melem at the Aqueous Solution−Au(111) Interface

In Situ STM Imaging of the Structures of Pentacene Molecules Adsorbed on Au(111)

Achieving High Efficiency in Solution-Processed Perovskite Solar Cells Using C60/C70 Mixed Fullerenes

Contact Info

Product

Resources

About

Achieving High Efficiency in Solution-Processed Perovskite Solar Cells Using C₆₀/C₇₀ Mixed Fullerenes